What reasons was the Berlin Wall built?

Related questions

1. Which side of the Berlin wall had graffiti?
2. Why was the Berlin Wall put up in the first place?
3. Why did Germany build the Berlin Wall?
4. How many people escaped the Berlin Wall?
5. Did the Berlin Wall Work?
6. Did the Berlin Wall completely surround West Berlin?
7. Why did Berlin Wall come down?
8. Why was the Berlin Wall taken down?
9. Who took down the Berlin Wall?
10. Why was the Berlin Wall erected?

Tags

1. #begins
2. #refugees
3. #effort
4. #soviet
5. #short
6. #symbolize
7. #government
8. #communist
9. #relations
10. #crisis
11. #building
12. #attempting
13. #caused
14. #construction
15. #itself
16. #leave
17. #divide
18. #berlin
19. #germany